From a "common good" standpoint, I would ask "What is good for our culture? What is good for our community?" First, homosexuality is an activity that is inherently dangerous and cannot be made healthy. It carries health risks that may be reduced, but cannot be entirely avoided. Additionally, it can also put people at risk who are not engaged in that activity. Since it cannot be made healthy, and it puts others at risk, it seems to make sense that, as a community, we ought not do anything to encourage it. I wouldn't suggest actively discouraging homosexuality, but at the very least, let's not go out of our way to encourage it.

i'm a little confused here. are you saying that there are homosexual specific diseases? or are you referring to some other source that would put a community at risk?